CUTE PURPLE DINOSAUR

2) Change all U's to V's (which is proper Latin anyway):

CVTE PVRPLE DINOSAVR

3) Extract all Roman Numerals:

C V V L D I V

4) Convert into Arabic values:

100 5 5 50 500 1 5

5) Add all the numbers:

666

Thus, Barney is Satan.

Submitted by Dave